Pipe or tube joint



July 2, 1940. J. J. DUNN 2,206,166

BIPE OR TUBE JOINT Filed Jan. 21. 1958 Fllli- ZWZQWX,

Patented July 2, 1940 UNITED STATES PATENT, OFFICE PIPE on TUBE JOINT Jerry Jay Dunn, Ellwood City, Pa., assignor to glational Tube Company, acorporation of New ersey Application January 21, 1938, Serial No. 186,207

2 Claims. 285-146) This invention relates to pipe or tube Joints in being a condition which might be met in wells general but ispartieularly concerned with wellof extreme depth, the joint will not fail, due to casing joints which must carry considerable tenthe fact that each type of interfastening carries sion. One of the objects of the present inventor a proportionate share of the stress.

is to provide a joint capable of being safely It will be noted that the threads are fashioned C stressed in tension with a force equaling. or at so that only their sides interen'gage. This asleast closely approximating, the tensile strength sures tightness when the parts are screwed toof the casing itself. sether. Since the weld carries a share of the A specific example of ajoint embodying the tension, the wedging action of the threads will features of the invention is disclosed by the 8.0- not be suflicient at any time to spring the 10 companying drawing, in which: threaded parts.

Figure 1 is a longitudinal section through one I claim: I wall 01' the joint; and, I 1. A pipe or tube joint comprising a male Figure 2 is an enlargement of the threads part having a threaded end portion and an shown by Figure 1. outer shoulder spaced a substantial distance More specifically, this joint includes a male from the termination of the threads of said end" part I having a threaded tapered end portion 2 portion, and a female part having a threaded and an outer shoulder 3 spaced from the inner portion engaging said threaded end portion of termination of this end portion. A cylindrical said male part and having an end portion with portion 4 is interposed between the portion 2 and a wall of reduced thickness extending to adjav th h ld 3, cently opposed relationship with said shoulder The other part of the joint is a, female part 5. and welded to the latter, said end portion with having a threaded tapered portion 6 engaging the Said wall of reduced thickness acting to distribute portion 2 of the male part I and an end portion n i n th ou h both Sa d thre ded and welded 1 extending to adjacently opposed relationship P s w n Said Joint is tens one t with the shoulder 3. Due to this relationship, a A p p or tube Joint c p in a male part 2 circumferential groove is provided and weld vin aded end portion and a female D metal 8 is deposited in this groove so as to weld having a hreaded portion engag n Said hreadthe end portion 1 to'the shoulder 3. ed end portion of said male part and having an Inside the diameter of the male part, 1 equals en portion with a wall of reduced thickness ex- 30 the inside diameter of the casing. The thick-' en ng for a S n l nce ey nd the nesses'of the end portion lot the female part and end of the threads of said threaded end poroi the portion! of the male part are proportion of said male part with its end welded to the tloned to distribute tension at the joint through latter, said end portionwith said wall of reduced the threaded portions 2 and 6, and the welded thickness acting to distribute tension through 35 parts I and I, in proportion to their relativetenboth said threaded and welded parts when said slle strengths. Therefore, even though the ultijoint is tensioned. mate strength of either type of intertastening is L JERRY JAY DUNN. insumcient to carry the applied tension, this 

